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Discussion Starter · #1 · (Edited)
I was wondering if anyone happened to know if the engines in the A5 3.2 and the current TT 3.2 were identical. It seems that Abt will be marketing their supercharger setup out of the TT-R. Was hoping for possible compatibility since 355hp would be pretty awesome!

-Ray
 

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Unfortunately I can't say if the engines are the same, or if the conversion would be compatible. However, I can say that 355BHP is definately awesome, hence why I bought an S5! Why not just upgrade to S5?
 

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Discussion Starter · #3 · (Edited)
Unfortunately I can't say if the engines are the same, or if the conversion would be compatible. However, I can say that 355BHP is definately awesome, hence why I bought an S5! Why not just upgrade to S5?
In pure theory, adding 50% more power requires 7.5 psi of boost, which is a mild upgrade. Such a kit including supporting mods would probably cost less than $10k. That barely covers the market adjustment cost for an S5, let alone the base price difference and the wait time. Plus the decision could be made at a later date.

It's more food for thought than anything else (not sure that I would want to void my warranty and risk blowing up my brand new engine anyway). That being said, if you haven't checked out the Abt kit on the TT, you should definitely do so! It's a pretty amazing exhaust note, I'm sure the power delivery is completely different from the S5 (more midrange-heavy as most supercharged applications are). Just one more option out there. Here are the videos:

http://youtube.com/watch?v=fAG2KLZtFnc
http://youtube.com/watch?v=FerWadwF1bM
http://youtube.com/watch?v=cQw4XhCLWWQ
http://youtube.com/watch?v=LjQpF8hyzSs

-Ray
 

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Discussion Starter · #5 ·
That's definitely good news. And now for the bad news: it looks like they are not the same at all. Here's the results of my research:

A5 3.2FSI:
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variable valve lift
265hp @ 6500rpm
243ft-lb @ 3000-5000rpm
Block: aluminum alloy
Head: aluminum alloy
Bore: 85.5mm
Stroke: 92.8mm
Compression Ratio: 12.5:1

TT 3.2 VR6:
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250hp @ 6300rpm
236ft-lb @ 2500-3500rpm
Block: Cast iron
Head: Aluminum Alloy
Bore: 84.0mm
Stroke: 95.9mm
Compression Ratio: 11.3:1

The quick observation is that the 3.2FSI is absolutely not as capable of a boost platform both because of its super high compression ratio and the aluminum block design. At 12.5:1, it is a more efficient powerplant, which is why it gets better mpg and also more power, displacement being equal (the variable lift probably also lends itself to that, as the VR6 motor only has variable timing). Also the FSI has less stroke, which will make it a bit more rev-happy (hence the peak HP occuring higher in the rev band), and of course aluminum construction means the whole thing is much lighter.

So yeah, the quick answer is no it can't be done. Oh well, can't blame a guy for hoping! =P

-Ray
 

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Worth a shot...

I have to admit, I wouldn't change from the 4.2 S5, but I reckon the '5' could be turned into a right blast of a sportscar with a light-weight sooped 3.0 or 3.2 and high-spec suspension, wheels and brakes. A real hoot.

Hence my idea for the perfect line-up at the sporty end of the range

A5 Clubsport - 3.0 Supercharger plus race-spec suspsnsion and DTM bodykit
S5 - As it is.
RS5 - 4.2 Twin turbo 480bhp plus usual stealthy 'pumped' look body.
 

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Discussion Starter · #8 ·
WOW that would be so nice just give it another year im sure they will drop the kit for the A5.
The biggest obstacle would be getting around the 12.5:1 compression with fancy ECU tuning, otherwise you'll be doing maybe 3-4 psi at best on pump gas which really wouldn't even be worth the cost and trouble. Everything else can be easily dealt with.

-Ray
 

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I was wondering if anyone happened to know if the engines in the A5 3.2 and the current TT 3.2 were identical. It seems that Abt will be marketing their supercharger setup out of the TT-R. Was hoping for possible compatibility since 355hp would be pretty awesome!
This question seems to pop up from time to time. They are absolutely not the same engines. Both have the same displacement and both are V6, but that seems to be pretty much where the similarities end.

TT 3.2 is the same engine a 3.2 A3 has, which is an older generation Audi V6 (or actually a VR6 with a narrower cylinder layout for transverse installation into a small-size car). Some notable differences:

1) A5 3.2 has FSI (Fuel Stratified Injection), the TT does not. From Audi: "FSI direct injection technology increases the torque and power of spark-ignition engines, makes them as much as 15 percent more economical and reduces exhaust emissions. In contrast to conventional intake manifold injection on conventional spark-ignition engines, FSI engines inject fuel directly into the combustion chambers." You can hear the FSI on idle from the a bit diesel-like pump sound it makes, the TT 3.2 actually sounds better.

2) A5 3.2 has the latest and greatest, Audi valve-lift (AVS), the TT does not. From Audi: "More power and torque with less fuel consumption – that is the dream of every engine designer. With the Audi valvelift system, which manages the inlet valve timing in a gasoline engine in a very innovative way, that dream becomes a reality. Audi uses this technology for its direct-injection 2.8 and 3.2-liter V6-FSI engines in the A4, A5, A6 and A8." and "The FSI engines with AVS sport a few other special features. A new type of sensor technology feeds data to their management systems. It gets its information from the position of the adjustable inlet camshafts and no longer from the pressure in the inlet manifold as before, which is in fact constant when operating with the throttle wide open."

3) Last but not least, the 3.2 V6 (or actually, a VR6) on the TT is a transverse engine combined to a Haldex electro-hydraulic limited-slip coupler four wheel drive, whereas the 3.2 V6 FSI on the A5 uses a longitudinal arrangement and is connected to the mechanical Torsen limited slip differential for its 4WD, so the drivetrain setup is completely different as well. Of course both also use completely different automatic gearboxes.

Some links:
http://www.audiworld.com/news/08/audi-valvelift-system/content.shtml
http://en.wikipedia.org/wiki/VR6
http://www.audi.com/audi/com/en2/tools/glossary/engine_driveline/fsi.html
 
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